Advertisement for orthosearch.org.uk
Results 1 - 3 of 3
Results per page:
Applied filters
Include Proceedings
Dates
Year From

Year To
Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_16 | Pages 75 - 75
1 Dec 2021
Stoddart J Garner A Tuncer M Cobb J van Arkel R
Full Access

Abstract

Objectives

There is renewed interest in bi-unicondylar arthroplasty (Bi-UKA) for patients with medial and lateral tibiofemoral osteoarthritis, but a spared patellofemoral compartment and functional cruciate ligaments. The bone island between the two tibial components may be at risk of tibial eminence avulsion fracture, compromising function. This finite element analysis compared intraoperative tibial strains for Bi-UKA to isolated medial unicompartmental arthroplasty (UKA-M) to assess the risk of avulsion.

Methods

A validated model of a large, high bone-quality tibia was prepared for both UKA-M and Bi-UKA. Load totalling 450N was distributed between the two ACL bundles, implant components and collateral ligaments based on experimental and intraoperative measurements with the knee extended and appropriately sized bearings used. 95th percentile maximum principal elastic strain was predicted in the proximal tibia. The effect of overcuts/positioning for the medial implant were studied; the magnitude of these variations was double the standard deviation associated with conventional technique.


Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_16 | Pages 16 - 16
1 Dec 2021
Munford M Stoddart J Liddle A Cobb J Jeffers J
Full Access

Abstract

Objectives

Unicompartmental and total knee arthroplasty (UKA and TKA) are successful treatments for osteoarthritis, but monolithic implants disrupt the natural homeostasis of bone which leads to bone loss over time. This can cause problems if the implant needs to be revised. This study aimed to demonstrate that tibial implants made from titanium lattice could replace the tibial condyle surface while minimising disruption of the bone's natural mechanical loading environment. A secondary aim was to determine whether implants perform better if they replicate more closely bone's mechanical modulus, anisotropy and spatial heterogeneity. This study was conducted in a human cadaveric model.

Methods

In a cadaveric model, UKA and TKA procedures were performed on 8 fresh-frozen knee specimens by a board-certified consultant orthopaedic surgeon, using tibial implants made from conventional monolithic material and titanium lattice structures. Stress at the bone-implant interfaces was measured with pressure film and compared to the native knee.


Orthopaedic Proceedings
Vol. 84-B, Issue SUPP_II | Pages 136 - 136
1 Jul 2002
Horne JG Stoddart J Devane P Fielden J
Full Access

Aim: To ascertain whether there is a relationship between time to surgery and mortality in hip fracture patients.

Method: The records of 120 patients admitted with hip fractures were examined. The approximate time of injury, the time of admission to hospital, the time of surgery, the number of medical co-morbidities, the A.S.A. grade, age, and length of hospital stay, were recorded. Death statistics were obtained from the Registrar of Births Deaths and Marriages. An analysis was then performed to assess the presence of correlation between time from injury to surgery, time from admission to surgery and three and six-month mortality in patients who were A.S.A. grades two or three.

Results: Preliminary analysis of the data showed a strong correlation between time from injury and the time from admission, to surgery and subsequent death. When these times exceeded 24 hours the mortality increased.

Conclusion: This study suggested that every effort should be made to operate on patients with hip fractures within 24 hours of admission to minimise mortality resulting from this injury.